JP4663595B2 - Bonnet structure of a swing work machine - Google Patents

Description

  The present invention relates to a bonnet structure of a turning work machine in which a turning board is supported on a traveling device so as to be rotatable around a turning axis.

A conventional swivel work machine such as a construction machine has a swivel board supported on a traveling device so as to be rotatable around a vertical swivel axis, and a bonnet for housing an engine is provided at the rear of the swivel board. The bonnet is provided with an opening / closing cover that covers the upper side of the engine, and the opening / closing cover is supported so as to be able to open and close in the vertical direction with the front end side as a fulcrum, and a damper that opens and closes the opening / closing cover around the horizontal shaft is provided. Some have adopted the provided bonnet structure.
In the bonnet structure of this type of conventional swivel work machine, the open / close cover is simply made of a plate material such as an iron plate or a synthetic resin plate, and the front end of the open / close cover is supported by a hinge so as to be openable and closable around a horizontal support shaft. One end of the damper is attached to a frame or the like in the bonnet, and the other end of the damper is attached directly or via a stay member or the like on the inner surface side of the opening / closing cover. The opening / closing cover is opened and closed by applying the expansion / contraction force of the damper to the opening / closing cover (for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-125742

Therefore, in the conventional case, since the force due to the expansion / contraction operation of the damper acts directly on the opening / closing cover, the opening / closing cover may be deformed if the rigidity of the opening / closing cover itself is weak, and the opening / closing cover needs to be formed of a thick plate material. was there. In addition, if the opening / closing cover itself has low rigidity, the opening / closing cover may rattle during the opening / closing operation of the opening / closing cover, and a smooth opening / closing operation may not be performed.
In view of the above problems, the present invention eliminates the risk of the opening / closing cover being deformed by the force of the expansion / contraction operation of the damper, even when the rigidity of the opening / closing cover itself is weak, and allows the opening / closing cover to be opened and closed smoothly. It is.

The technical means of the present invention for solving this technical problem includes a turning board supported on a traveling device so as to be rotatable about a turning axis in the vertical direction, and an engine at a rear portion on the turning board. A bonnet structure of a swiveling work machine provided with a bonnet for storing the door, the bonnet having an opening / closing cover, the opening / closing cover being supported to be freely opened / closed at one end thereof, and a damper for opening / closing the opening / closing cover provided in the bonnet In
On the inner surface side of the opening / closing cover, a reinforcing frame is provided along the inner surface of the opening / closing cover from one end side thereof toward the free end side, and one end portion of the reinforcing frame is supported so as to be swingable around the support shaft. One end is attached to the support frame side in the bonnet, the other end of the damper is attached to the free end side of the reinforcement frame ,
A connecting plate is provided in the middle portion of the reinforcing frame, the connecting plate is disposed between the reinforcing frame and the inner surface of the opening / closing cover, and the middle portion of the reinforcing frame is fixed to the inner surface of the opening / closing cover via the connecting plate. In the point.

According to another technical means of the present invention, the opening / closing cover includes an upper horizontal portion, an inclined portion inclined downward from the free end side of the horizontal portion, and a hanging portion protruding downward from the lower end side of the inclined portion. The connecting plate is fixed to the inner surface of the lower portion of the inclined portion of the opening / closing cover so as to be close to the bent line A portion between the inclined portion and the hanging portion. is there.
In another technical means of the present invention , the mounting frame is disposed and fixed in the direction orthogonal to the reinforcing frame on the inner surface of one end of the opening / closing cover, and one end of the reinforcing frame is fixed to the mounting frame. A hinge piece is provided on the mounting frame so as to protrude outward, and a protruding end portion of the hinge piece is supported by a support frame in the bonnet so as to be rotatable around the support shaft .

Another technical means of the present invention, the sound absorbing material is provided on the inner surface of the cover, the reinforcing frame, together constituted by sheet material bent arcuately to follow the inner surface of the cover, the cover The inner end surface of the reinforcing frame is disposed so as to protrude inward in the plate width direction from the inner surface, and is set to have a height that substantially matches the inner surface of the sound absorbing material.

  According to the present invention, when the opening / closing cover is opened and closed, the force due to the expansion / contraction operation of the damper acts on the reinforcing frame, and the force due to the expansion / contraction operation of the damper does not directly act on the opening / closing cover. Even if the rigidity is weak, there is no risk of the opening / closing cover being deformed. Further, when the opening / closing cover is opened / closed, the opening / closing cover does not rattle by acting on the opening / closing cover by the force of the expansion / contraction operation of the damper, and the opening / closing cover can be opened / closed smoothly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In FIG. 1, a swivel working machine 1 as a backhoe has a swivel base on a top of a traveling device 3 having a pair of left and right crawler traveling bodies 2 so as to be rotatable around a swivel axis X in a vertical direction via a swivel bearing 13. 4, and a working device 5 is provided at the front end of the swivel base 4.
The work device 5 includes a swing bracket 12 attached to the front end of the swivel 4 so as to be swingable left and right, a boom 6 connected to the swing bracket 12 so as to be swingable up and down, and swinging up and down at the tip of the boom 6. The excavation work device has an arm 7 that is movably connected and a bucket 8 that is pivotally connected to the tip of the arm 7, and the swing bracket 12, the boom 6, the arm 7, and the bucket 8. Are actuated by hydraulic cylinders 9, 10, 11 and the like, respectively.

A rear bonnet 15 is mounted on the rear part of the swivel base 4, and a control unit having a driver's seat, a control lever, a control pedal, and the like is provided on the front side of the rear bonnet 15. It is surrounded by a cabin 17 provided in the section.
As shown in FIGS. 2 to 4, a plate-like turning board 19 is provided at the bottom of the turntable 4. A pair of left and right vertical ribs 20L and 20R are provided on the swivel board 19 so as to extend rearward (substantially C-shaped) from the front side of the swivel board 19, and are placed on the front of the pair of left and right vertical ribs 20L and 20R. The plate 21 is fixed by welding or the like, the lower plate 22 is fixed to the lower surface side of the front end portions of the vertical ribs 20L and 20R by welding or the like, and the support cylinder 23 is welded between the front end portions of the upper plate 21 and the lower plate 22. The mounting bracket 24 for mounting the work device 5 is constituted by the front portion of the pair of vertical ribs 20L, 20R, the front portion of the upper plate 21, the lower plate 22, and the support cylinder 23. Is formed to project forward from the swivel board 19.

A partition wall 26 extending in the left-right direction is erected in the front-rear halfway portion of the swivel board 19, and an engine room 27 is formed on the rear side of the partition wall 26, where an engine 29, a radiator, and the like are disposed. ing. An arcuate mounting wall 31 projects upward from the rear end of the swivel board 19.
As shown in FIGS. 2, 3, and 5, a pair of left and right front cabin supports 35 for mounting and fixing the lower end of the front end of the cabin 17 on the left front portion of the swivel board 19, and the rear lower end of the cabin 17 are provided. A pair of left and right rear cabin supports 36 for mounting and fixing are provided. The pair of left and right front cabin supports 35 are attached to the left front end portion of the turning board 19 via a stay or the like, and the pair of left and right rear cabin supports 36 are attached to the turning board 19 via a stay or the like not shown. ing.

As shown in FIGS. 1 to 5, a counterweight 41 is provided at the rear end of the swivel board 19, and side protectors 42 that protect the left and right corners of the rear end of the swivel base 4 are provided on the left and right sides of the counterweight 41. It has been. The cabin 17 is disposed on the left front part of the swivel board 19, the rear bonnet 15 is disposed on the rear part of the swivel board 19, and a side bonnet 47 is provided on the right front part of the swivel board 19.
The rear bonnet 15 is on the upper side and the front side of the counterweight 41 and is inward in the left-right direction of the pair of left and right side protectors 42. The counterweight 41, the pair of side protectors 42, and the rear bonnet 15 The surrounding engine room 27 is formed on the rear end of the swivel board 19.

A hydraulic oil tank, a fuel tank, and the like are disposed on the front side of the partition wall 26 and on the right side of the swivel board 19, and these are covered with a side bonnet 47.
The rear bonnet 15 includes a front cover 49, an open / close cover (rear cover) 50, a left side cover 51, and a right side cover 52. Covered by.
A support frame 55 is provided in the rear bonnet 15, and the support frame 55 is connected to the left leg 56, the right leg 57, the rear leg 58, and the upper ends of these legs 56, 57, 58. It is mainly composed of a plate 60 and the like, and is disposed so as to straddle the engine 29. A left cover body 61 and a right cover body 62 constituting the front cover 49 of the rear bonnet 15 are provided on the upper side of the support frame 55.

  The left leg 56 of the support frame 55 is formed of a square pipe or the like, the right leg 57 is formed of a metal rod having an L-shaped cross section, and the lower ends of the left leg 56 and the right leg 57 are attached to a mounting plate 64. For example, it is attached and fixed to the swivel board 19 through the partition wall 26 and the like. The lower end of the rear leg body 58 is attached and fixed to the revolving board 19 by the attachment plate 66 through the attachment wall 31. Further, the support plate 60 has a horizontally long strip shape, and the left end portion of the support plate 60 and the upper end portion of the left leg body 56 are connected and fixed by welding or the like, and the right end portion of the support plate 60 and the upper end portion of the right leg body 57 are fixed. The parts are connected and fixed by welding or the like. The upper end of the rear leg 58 is connected and fixed to the rear end of the support plate 60 and the upper end of the right leg 57 through a connecting plate.

The cabin 17 is mounted on the left side of the swivel board 19 so that the rear end portion of the cabin 17 is placed on the rear bonnet 15. That is, as shown in FIGS. 1 and 3, a mounting recess 63 that is recessed from the lower side toward the upper side so as to be placed on the rear bonnet 15 is provided at the rear end of the cabin 17.
The left and right two places at the front end portion of the lower end (step) of the cabin 17 are respectively mounted and fixed on the front cabin support 35 via vibration-proof members, and the left and right two places at the rear portion of the lower end (step) of the cabin 17 The rear cabin support 36 is mounted and fixed via a vibration isolation member. The left and right two places of the mounting recess 65 (the rear end portion of the cabin 17) of the cabin 17 are supported by the front cover 49 (the right cover body 62) of the bonnet 15 and the pair of left and right vibration isolation members. It is mounted and fixed on the upper surface of 55 support plates 60.

As shown in FIGS. 2 to 4, an engine 29 is mounted horizontally on the rear upper surface of the swivel board 19 in the rear bonnet 15 (engine room 27) so that the crankshaft is in the left-right direction. Are mounted and fixed to the partition wall 26 and the mounting wall 31 via a vibration isolator or the like. The engine 29 is disposed on the front side of the counterweight 41, and a cooling fan 68 and a radiator are provided on the right side of the engine 29, and the cooling fan 68 is rotationally driven by the power of the engine 29.
The opening / closing cover 50 of the rear bonnet 15 is supported so that it can be opened and closed with its one end side (front end side) as a fulcrum, and the opening / closing cover 50 can be flipped upward with its front end side as a fulcrum. Is provided in the rear bonnet 15.

As shown in FIGS. 5 to 10, the opening / closing cover 50 is made of a plate material such as an iron plate or a synthetic resin plate, and is rearward from the horizontal portion 73 on the upper side and the free end side (rear end side) of the horizontal portion 73. It is bent and formed in a bow shape so as to have an inclined portion 74 inclined downward and a hanging portion 75 protruding downward from the lower end side of the inclined portion 74. A sound absorbing material 76 is provided on the inner surface of the opening / closing cover 50. The sound absorbing material 76 may be provided not only on the opening / closing cover 50 but also on the front cover 49 and the side covers 51 and 52.
A reinforcing frame 78 in the front-rear direction is provided on the inner side of the opening / closing cover 50 in the center in the left-right direction. As shown in FIGS. 11 and 12, the reinforcing frame 78 is made of a plate material that is bent in an arc shape along the inner surface of the opening / closing cover 50, and is disposed so as to protrude inward in the plate width direction from the inner surface of the opening / closing cover 50. The reinforcing frame 78 is provided along the inner surface of the opening / closing cover 50 in the front-rear direction from one end side (front end side) toward the free end side. The rear leg body 58 of the support frame 55 is disposed corresponding to the center B in the left-right direction of the opening / closing cover 50, and the reinforcing frame 78 is provided on the opening / closing cover 50 in order to prevent the reinforcement frame 78 from interfering with the rear leg body 58. It is arranged at a position slightly shifted to the left from the center B in the left-right direction.

As shown in FIGS. 7 to 12, a connecting plate 79 is provided in the middle of the reinforcing frame 78 in the front-rear direction. The connecting plate 79 is disposed between the reinforcing frame 78 and the inner surface of the opening / closing cover 50. A midway portion is fixed to the inner surface of the opening / closing cover 50 via a connecting plate 79 by welding or the like. The connecting plate 79 is fixed to the inner surface of the lower portion of the inclined portion 74 of the opening / closing cover 50 so as to be close to the bent line A portion between the inclined portion 74 and the hanging portion 75.
As shown in FIGS. 5 to 10, a mounting frame 81 is disposed on the inner surface of one end (front end) of the opening / closing cover 50 in the left-right direction perpendicular to the reinforcing frame 78, and is fastened by a fastener 82 such as a bolt nut. It is fixed. The mounting frame 81 is composed of a U-shaped channel material or the like, one end (front end) of the reinforcing frame 78 is fixed to the mounting frame 81 by welding or the like, and a pair of left and right hinge pieces 84 are outwardly attached to the mounting frame 81. It is provided in a protruding shape (forward protruding shape). A pair of left and right support shafts 86 are attached to the support plate 60 of the support frame 55, the covers 61, 62 and the like via the support plate 85. The hinge piece 84 is fixed to the mounting frame 81 by a fastener 91 such as a bolt, and a support cylinder 87 is fixed to the outward projecting portion of the hinge piece 84 by welding or the like. The protruding end portions of the pair of left and right hinge pieces 84 are held on the pair of left and right support shafts 86 so as to be rotatable around the support shaft 86 via the support cylinders 87, respectively. The projecting end portion is supported by the support frame 55 in the rear bonnet 15 so as to be rotatable about the left and right support shaft 86, and one end portion (front end portion) of the reinforcing frame 78 swings about the left and right support shaft 86. It is supported freely. The reinforcing frame 78 is set so that the inner end surface thereof has a height that substantially matches the inner surface of the sound absorbing material 76.

The damper 71 is constituted by a hydraulic cylinder or the like, and one end of the damper 71 is attached to the support frame 55 side in the rear bonnet 15 via an attachment member 92 so as to be swingable around a support shaft 93 in the left-right direction. The end portion is attached to the free end side (rear end side) of the reinforcing frame 78 through an attachment hole 88, and is configured to open and close the opening / closing cover 50 by expansion and contraction of the damper 71.
A lock mechanism 90 that locks the open / close cover 50 in the closed state is provided on the inner surface of the lower end of the open / close cover 50 so that the open / close cover 50 can be automatically locked in the closed state when the open / close cover is closed.

  According to the above embodiment, the reinforcing frame 78 is provided on the inner surface side of the opening / closing cover 50 along the inner surface of the opening / closing cover 50 from the one end side to the free end side, and one end portion of the reinforcing frame 78 is the support shaft. Since one end portion of the damper 71 is attached to the support frame 55 in the rear bonnet 15 and the other end portion of the damper 71 is attached to the free end side of the reinforcing frame 78. When the opening / closing cover 50 is opened and closed, the force due to the expansion / contraction operation of the damper 71 acts on the reinforcing frame 78, and the force due to the expansion / contraction operation of the damper 71 does not directly act on the opening / closing cover 50. Even if the rigidity of the door is weak, there is no possibility that the opening / closing cover 50 is deformed. Even if the rigidity of the opening / closing cover 50 itself is weak, when the opening / closing cover 50 is opened / closed, the opening / closing cover 50 is not rattled by acting on the opening / closing cover 50 by the force of the expansion / contraction operation of the damper 71. 50 can be opened and closed smoothly.

  A mounting frame 81 is arranged and fixed on the inner surface of one end of the opening / closing cover 50 in a direction orthogonal to the reinforcing frame 78, and one end of the reinforcing frame 78 is fixed to the mounting frame 81, and the mounting frame 81 is hinged. Since the piece 84 is provided in an outward projecting manner, and the projecting end of the hinge piece 84 is supported on the support frame 55 side in the bonnet 15 so as to be rotatable around the support shaft 86, the mounting frame 81 can be opened and closed. One end side of the opening / closing cover 50 that is the fulcrum side can be effectively reinforced, and the opening / closing cover 50 can be held with a simple structure of the mounting frame 81 and the reinforcing frame 78 having rigidity.

  Further, a connecting plate 79 is provided in the middle of the reinforcing frame 78, and the connecting plate 79 is disposed between the reinforcing frame 78 and the inner surface of the opening / closing cover 50, and the middle of the reinforcing frame 78 is opened / closed via the connecting plate 79. Since it is fixed to the inner surface of the cover 50 and the connecting plate 79 is fixed to the lower inner surface of the inclined portion 74 of the opening / closing cover 50 so as to be close to the bent line A portion between the inclined portion 74 and the hanging portion 75, Since the middle part of the reinforcing frame 78 is fixed in the vicinity of the bent line A portion of the opening / closing cover 50 whose rigidity is relatively strong by bending, the deformation of the opening / closing cover is also performed from this point. This can be effectively prevented and the opening / closing operation of the opening / closing cover can be performed more smoothly.

  In addition, a sound absorbing material 76 is provided on the inner surface of the opening / closing cover 50, and the reinforcing frame 78 is formed of a plate material bent in an arc shape along the inner surface of the opening / closing cover 50, and inward in the plate width direction from the inner surface of the opening / closing cover 50. Since the inner end surface of the reinforcing frame 78 is set to a height that substantially coincides with the inner surface of the sound absorbing material 76, the reinforcing frame 78 is opened when the opening / closing cover 50 is opened. It can be hidden by the sound absorbing material 76 to make it inconspicuous, the appearance is improved, the protrusions on the inner surface side of the opening / closing cover 50 are reduced, and the inside of the opening / closing cover 50 can be prevented from being narrowed by the reinforcing frame 78. The problem of impeding the cooling performance of the engine by the reinforcing frame 78 is also eliminated.

  INDUSTRIAL APPLICABILITY The present invention can be used for a turning work machine such as a backhoe in which an engine is mounted on a turning table that is rotatably provided around a turning axis on a traveling device.

It is a side view of the turning work machine which shows one Embodiment of this invention. It is a top view of the turntable of the state which removed the work apparatus. It is a left view of the turntable of the state which removed the working device. It is a rear view of the turntable of the state which removed the working device. It is a left view of the turning board part. It is a side view of the hinge part of the opening / closing cover. It is a side view of the opening-and-closing cover. It is a top view of the opening-and-closing cover. It is a rear view of the opening / closing cover. It is a sectional side view of the opening-and-closing cover. It is a side view of the reinforcement frame and a connection board. It is a rear view of the same reinforcing frame and connecting plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turning work machine 3 Traveling apparatus 15 Rear bonnet 19 Turning board 29 Engine 50 Opening / closing cover 55 Support frame 71 Damper 73 Horizontal part 74 Inclination part 75 Hanging part 76 Sound absorbing material 78 Reinforcement frame 79 Connecting plate 86 Support shaft

Claims (4)

On the traveling device (3), there is provided a turning board (19) supported so as to be rotatable around a turning axis (X) in the vertical direction, and the engine (29) is accommodated in the rear part on the turning board (19). The bonnet (15) is provided with an opening / closing cover (50), and the opening / closing cover (50) is supported to be freely opened and closed with one end thereof as a fulcrum, and opens / closes the opening / closing cover (50). In the bonnet structure of the turning work machine (71) provided in the bonnet (15),
A reinforcing frame (78) is provided on the inner surface side of the opening / closing cover (50) along the inner surface of the opening / closing cover (50) from one end side to the free end side, and one end portion of the reinforcing frame (78) is a support shaft. (86) is supported so as to be swingable around, one end of the damper (71) is attached to the support frame (55) side in the bonnet (15), and the other end of the damper (71) is a reinforcing frame ( 78) is attached to the free end side ,
A connecting plate (79) is provided in the middle of the reinforcing frame (78). The connecting plate (79) is disposed between the reinforcing frame (78) and the inner surface of the opening / closing cover (50), and the reinforcing frame (78). A bonnet structure for a swivel working machine, characterized in that a midway portion is fixed to the inner surface of the opening / closing cover (50) via a connecting plate (79) . The opening / closing cover (50) protrudes downward from the upper horizontal portion (73), the inclined portion (74) inclined downward from the free end side of the horizontal portion (73), and the lower end side of the inclined portion (74). A bent portion (75) is formed in a bow shape, and the connecting plate (79) is close to a bent line A portion between the inclined portion (74) and the hanging portion (75). The bonnet structure for a swing working machine according to claim 1, wherein the bonnet structure is fixed to an inner surface of a lower portion of the inclined portion (74) of the opening / closing cover (50) . A mounting frame (81) is arranged and fixed on the inner surface of one end of the opening / closing cover (50) in a direction orthogonal to the reinforcing frame (78), and one end of the reinforcing frame (78) is attached to the mounting frame (81). The hinge piece (84) is provided on the mounting frame (81) so as to protrude outward, and the protruding end of the hinge piece (84) is attached to the support frame (55) in the bonnet (15). 3. A bonnet structure for a swing work machine according to claim 1 or 2 , wherein the bonnet structure is supported so as to be freely rotatable around . A sound absorbing material (76) is provided on the inner surface of the open / close cover (50), and the reinforcing frame (78) is formed of a plate material bent in an arc shape along the inner surface of the open / close cover (50). 50) is arranged so as to protrude inward in the plate width direction from the inner surface of the reinforcing frame (78), and the inner end surface of the reinforcing frame (78) is set to have a height substantially matching the inner surface of the sound absorbing material (76). The bonnet structure of the turning work machine according to any one of claims 1 to 3 .

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